Mlok arca rail

Would like to add some arca rail to my RAW chassis. Annex defense, made in USA, decent pricing good quality.
Bought 2 different lengths, not sure which one I was gonna like. Short is 3.11” Long is 4.7.

The long wins for me, fits using the partial slot way up front and mount ends just before the plenum, maybe thats the regulator. Will have to remove to adjust regulator if needed.

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